Method for mounting internal tower fittings

ABSTRACT

A method for installing tower fittings by introducing at least two separate supply modules into a wind turbine tower, wherein a separate supply module structurally includes one segment each of at least two system components of the wind turbine tower, and wherein an upper segment end is arranged on an upper edge, and a lower segment end on a lower edge, of the supply module, including: arranging the upper edge of a first separate supply module at an upper end of the wind turbine tower; connecting an upper segment end of the first separate supply module to a lower segment end of a corresponding system component of a second separate supply module; and arranging the upper edge of the second separate supply module at the upper end of the wind turbine tower.

REFERENCE TO RELATED APPLICATIONS

This application is a national stage application under 35 USC 371 ofInternational Application No. PCT/EP2014/062864, filed Jun. 18, 2014,which claims priority to German Application No. 20 2013 005 959.1, filedJul. 3, 2013, the entire contents of which are incorporated herein byreference.

FIELD OF THE INVENTION

The invention relates to a method for installing tower fittings byintroducing at least two separate supply modules into a wind turbinetower, wherein a separate supply module structurally comprises onesegment each of at least two system components of the wind turbinetower, and wherein an upper segment end is arranged on an upper edge,and a lower segment end on a lower edge, of the supply module.

BACKGROUND OF THE INVENTION

Powerful wind turbines require large rotors and high wind speeds. Highwind speeds are found far above the ground. The towers of the windturbines therefore have a very high construction. In addition, high windturbine towers permit larger rotors. For this purpose, the towersrequire a sufficiently high degree of stability in order to act as asupport structure for the large and therefore also heavy rotors. Saidtowers are constructed locally at the construction site of the windturbine since said towers are much too large for premanufacturing. Ithas proven successful to erect the towers from a plurality of concretetower segments arranged one above another. The tower segments here canbe completely or partially produced from semi-finished elements. Hightowers can thereby be efficiently erected even in remote areas. However,there is the problem of producing and installing the tower fittingswhich comprise, for example, conduction means for transmitting theelectrical energy generated in the nacelle or for transmitting controlsignals for operating the wind turbine, or a climbing device for theoperating personnel for climbing up the tower. The installation of thetower fittings in the erected tower is complicated and hazardous sincework at a great height is partly also required.

DE 10 2010 015 075 A1 discloses segmenting at least two systemcomponents of the tower fittings and structurally combining saidsegments to form separate supply modules. The supply modules arepreassembled at the construction site or ex works and, for installation,are introduced into the tower interior. A supply module is fastened hereto the tower inner wall at the designated location. The segments of thesystem components of supply modules adjacent to one another are coupledto one another, for example via series connection devices.Manufacturing-induced tolerances in the tower segments are compensatedfor here either during the connection of supply modules adjacent to oneanother or at the supply module which is fastened at the upper end ofthe wind turbine tower.

It is known from DE 20 2011 106 727 U1 to introduce tubular segmentssuccessively through the door into the tower where the respective systemcomponents are then connected to one another. The supply system is thusconstructed from the bottom upward and only mounted at the top of thetower in the final step.

Furthermore, it is known from DE 20 2010 007 565 U1 to suspendpreassembled interior fittings on the tower flange in each case, as aresult of which only a construction from the bottom upward is possible.The installation of the interior fittings is preferably carried out inthis case while the tower is still in a horizontal position.

SUMMARY OF THE INVENTION

An object on which the invention is based is the provision of a methodwhich further simplifies the installation of the tower fittings andincreases the safety of the installation personnel during theinstallation of the tower fittings.

The object is achieved by the features as broadly described below.Advantageous developments are described in the detailed embodimentsbelow.

In a method for installing tower fittings by introducing at least twoseparate supply modules into a wind turbine tower, wherein a separatesupply module structurally comprises one segment each of at least twosystem components of the wind turbine tower, and wherein an uppersegment end is arranged on an upper edge, and a lower segment end on alower edge, of the supply module, provision is made according to theinvention for the method to comprise the following steps: arranging theupper edge of a first separate supply module at an upper end of the windturbine tower; connecting an upper segment end of the first separatesupply module to a lower segment end of the corresponding systemcomponent of a second separate supply module; and arranging the upperedge of the second separate supply module at the upper end of the windturbine tower.

First of all, a few terms will be explained in more detail below:

A system component is understood as meaning components of the windturbine that are installed in the tower of the wind turbine in order toenable the maintenance and operation thereof. Said components can be,for example, power conduction means, signal conduction means,illuminating means or a climbing device for operating personnel.

An upper edge is understood as meaning that edge of a supply modulewhich, in the fitted position, is aligned with the nacelle of the windturbine. A lower edge is understood as meaning that edge of the supplymodule which is directed toward the tower base.

An upper end of the wind turbine tower is understood as meaning a regionat the upper end of the tower. Said region does not necessarily have tobe arranged directly at the highest point of the wind turbine tower. Itmay also be arranged a few meters below the highest point. In the caseof towers composed of a different material in sections, for example aconcrete tower at the bottom and a tubular steel tower placed on at thetop, each upper end of a portion is an “upper end” within the meaning ofthe invention.

The invention is based on the finding that the separate supply modulescan be connected to one another as they are being introduced into thewind turbine tower, before said supply modules are fastened, optionallyin their entirety, to the tower inner wall. During the introduction intothe tower interior, the supply modules are inserted from above, that isto say said supply modules are guided past the upper end of the windturbine tower. The upper edge of the first separate supply moduleintroduced first is arranged there on the lower edge of the secondseparate supply module to be introduced next. The segments of the systemcomponents of the two separate supply modules are connected to eachother via the segment ends arranged on the edges. The separate supplymodules which are now connected to each other are then lowered downwarduntil the upper edge of the second supply module is arranged at theupper end of the wind turbine tower. The operation is repeated until allof the supply modules which are to be installed have been introducedinto the tower interior. The separate supply modules which are connectedto each other are finally then fastened to the inner wall of the windturbine tower after the final separate supply module has been arrangedat the upper end of the wind turbine tower and the completely assembledsupply module has been brought into the final installation position.

The supply modules are therefore connected successively to one anotherand lowered into the tower. The connecting work for joining together thesupply modules can therefore be carried out at a central, stationarywork site. The installation personnel no longer needs to handle theconnecting points between the supply modules along the tower inner wall,but instead the supply modules which are to be installed migrate, as itwere, past the stationary work site. Since a stationary working platformfor the installation personnel is customarily provided in any case atthe upper end of the wind turbine tower, no additional outlay isrequired. In addition, said working platform provides greater safetythan mobile working devices which would have to be arranged in avertically movable manner on the tower inner wall. Furthermore, byconnecting the supply modules prior to fastening same to the windturbine tower, manufacturing-induced tower tolerances are circumvented.The connections of the segments of the system components to the upperend of the wind turbine tower are always arranged in a defined positionrelative to the tip of the tower. The position of the lower end of thesupply modules which are connected to one another is no longer ofimportance. Compensating work needs only to be carried out—if at all—atthe tower base. Since the work is not carried out there at a greatheight, the safety of the installation personnel should be ensured in asimple manner. It is now no longer necessary to carry out compensatingwork on the basis of the tower tolerances at each connecting pointbetween the separate supply modules. This considerably simplifies theinstallation of the tower fittings.

Furthermore, the fastening to the tower inner wall in particularprevents the supply module from being displaced in a horizontal plane.The main load in terms of weight of the supply module continues to besupported by the suspension at the upper tower end.

It is expedient to provide a working platform at the upper end of thewind turbine tower prior to the introduction of the separate supplymodules. The safety of the installation personnel is therefore increasedand the connecting work between the supply modules is facilitatedfurther.

In order further to increase the safety during the connecting work,provision is advantageously made, prior to the introduction of theseparate supply modules into the wind turbine tower, to provide aholding apparatus at the upper end of the wind turbine tower for the atleast temporary suspension of a separate supply module. The holdingapparatus advantageously comprises at least one connecting device forthe connection to a separate supply module. Furthermore, the holdingapparatus expediently has at least one load ring which is fastened tothe tower wall or tower upper edge, wherein the connecting devicecomprises at least one shackle or a lifting sling. The first separatesupply module can advantageously therefore be suspended at the upper endof the wind turbine tower before the segments of the system componentsare connected to those of the second separate supply module. Thesuspended supply module is secured by the holding device at the upperend of the wind turbine tower, and therefore the connection of thesystem component segments to a supply module arranged above thesuspended supply module is further simplified. The design of the holdingdevice, comprising a load ring and a shackle or a lifting sling, permitsa simple connection of the upper edge of the suspended supply module tothe holding apparatus. For this purpose, the supply module can have asupport plate to which the connecting devices are fastened.

After the introduction of the final separate supply module, the lattercan be fastened to the tower wall or tower upper edge by means of theload ring.

In an alternative embodiment, the support plate can be designed as anangled support plate for fastening the final separate supply module tothe tower wall or tower upper edge. With the aid of the angled supportplate, the final separate supply module can be hung over the tower upperedge and fastened to the tower wall or tower upper edge. The fasteningoutlay for the final separate supply module to the tower wall or towerupper edge is therefore reduced.

The holding apparatus can furthermore advantageously comprise at leastone support element which is fastened to the tower wall or to the towerupper edge and to which a support module comprising a mounting portionis releasably fastened, wherein the supply module has a mounting elementwith which the separate supply module, after the arrangement of theupper edge at an upper end of the wind turbine tower, is mounted on themounting portion of the support module. For this purpose, the supportmodule has a mounting portion in which the mounting element can bearranged. The mounting element is supported by the mounting portion. Asimple mounting of the separate supply modules on the support element ismade possible with the support module. The separate supply modules cantherefore be suspended in an uncomplicated manner on the upper edge ofthe wind turbine tower. Given a suitable design of the tower upper edge,the support module can be fastened to the tower upper edge even withoutthe use of a support element. For the temporary suspension on the upperedge of the wind turbine tower, the supply modules do not require anyfastening to the holding apparatus by means of the shackles. Theshackles can optionally be used for fastening the separate supplymodules after the final separate supply module has been introduced intothe tower interior.

The wind turbine tower is advantageously formed from at least two towersegments. Furthermore, it is expedient that the separate supply modulesspan a plurality of tower segments. A smaller number of separate supplymodules than the number of tower segments is therefore required forfitting into the tower interior. This reduces the amount of requiredconnecting work between the supply modules, and further simplifies andaccelerates the installation of the tower fittings. To reduce thediversity of variants of the separate supply modules, it is expedient todesign both the lowermost supply module in each case and the supplymodules in each case lying in between to be identical. A roughadaptation to the respective tower height is achieved via the number ofsupply modules lying in between and to be mounted. The precisecoordination with the ultimately required length of the complete supplymodule is achieved by adaptation of the uppermost separate supplymodule.

The system components expediently comprise power conduction means,signal conduction means, illuminating means and/or a climbing device foroperating personnel, wherein the illuminating means comprise lampsarranged discretely or continuously.

A tubular steel tower can advantageously be installed as an upper partof the wind turbine tower, wherein the lower part is a concrete tower.The supply modules are advantageously introduced into the concrete towerprior to the placing-on of a tubular steel tower. The system componentscan be installed in the tubular steel tower ex works, on theconstruction site or after the tubular steel tower has been erected. Byfitting the supply modules as per the method according to the inventionbefore the tubular steel tower is erected, it is ensured that the upperedge of the supply module fitted last in the concrete tower bearsagainst a defined point relative to the upper end of the wind turbinetower. The coupling between the system components installed in thetubular steel tower and the system components of the concrete tower cantherefore take place without special compensating work. Furthermore, asupport plate, which is of angled design, of a supply module introducedlast can be connected to the tubular steel tower in order to prevent thesupport plate from slipping off a tower upper edge of a concrete tower.

It is furthermore advantageous, prior to the introduction of theseparate supply modules into the wind turbine tower, to fasten at leastone fastening apparatus to at least one of the separate supply modules,said fastening apparatus having a clamping element which is connected tothe supply module and a guide element, comprising a fastening pieceprojecting laterally on the supply module, which is arranged between theclamping element and the supply module. Projecting laterally on thesupply module is understood as meaning that, when a supply module hangson the tower inner wall, the fastening piece runs along the wall and thesupply module does not cover the fastening piece.

The fastening apparatuses can therefore be introduced together with thesupply modules into the tower interior, which further simplifies thefitting of the separate supply modules. The guide element is movablehere in a vertical direction along the separate supply module, andtherefore the guide element can be arranged flexibly along the separatesupply module.

It is furthermore advantageously provided here, after the introductionof a final separate supply module, to fasten the fastening apparatus tothe tower wall of the wind turbine tower by means of the fasteningpiece, and to clamp the guide element to the supply module by means ofthe clamping element. Alternatively to the clamping element, a lockingelement may also be provided, the locking element releasably fasteningand at the same time locking the guide element to the supply module.

The fastening pieces can be reached directly from the front because ofthe lateral projection thereof from the supply modules. The installationpersonnel can therefore easily reach the fastening pieces and in anuncomplicated manner carry out the fastening of the supply modulesintroduced into the tower interior. By means of the fastening of thefastening pieces to the tower wall, the supply modules are secured inthe horizontal direction. A vertical displacement for aligning thesupply modules is furthermore permitted until the guide element of thefastening apparatus is clamped by means of the clamping element. Inorder to secure the separate supply modules in the vertical direction,the guide element is clamped between the clamping element and theseparate supply module. The clamping can be brought about by fasteningelements which press the clamping element onto the supply module. Thefastening elements can be actuated here from the front side of thesupply module. The supply module therefore cannot be moved further alongthe guide element.

The invention furthermore relates to a wind turbine tower, comprising aholding device for the suspension of a separate supply module at theupper end of a wind turbine tower for carrying out the abovementionedmethod. Reference is made to the above description for explanationpurposes.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with reference to theattached drawing in which an advantageous embodiment is illustrated. Inthe drawing:

FIG. 1 shows a schematic illustration of a wind turbine with towerfittings;

FIGS. 2a-d show a schematic illustration of individual method steps;

FIGS. 3a, b show a schematic illustration of the supply modulessuspended in the tower interior on a holding apparatus, with (a)shackles and (b) lifting slings;

FIG. 4 shows a schematic illustration of a hybrid tower;

FIGS. 5a, b show a schematic illustration of a supply module, a supportmodule and a support element in the separate state (a) and mounted state(b);

FIG. 6 shows a schematic illustration of a fastening apparatus arrangedon a supply module;

FIG. 7 shows a schematic cross-sectional view of a fastening apparatusarranged on a supply module; and

FIG. 8 shows a schematic illustration of the final supply modulefastened to an angled support plate.

DETAILED DESCRIPTION OF THE INVENTION

The method is carried out for the erection of a wind turbine, denoted inthe entirety thereof by the reference number 100. The wind turbine 100comprises a wind turbine tower 1 which is erected from a plurality oftower segments 10, 11, 12, 13, 14, 15, 16 and is designed as a hybridtower. The lower part of the hybrid tower is a concrete tower 19 and theupper part is a tubular steel tower 18. Furthermore, the wind turbine100 comprises a nacelle 101, which is connected to an upper end 17 ofthe wind turbine tower 1, and a rotor 102, which is mounted rotatably onone side of the nacelle 101. The rotor 102 is connected to an electricgenerator 104 via a shaft 103. Furthermore, the wind turbine 100comprises an operation controller 105 which is connected to thegenerator 104 and to the rotor 102 via signal lines. The operationcontroller 105 and the generator 104 are arranged in the nacelle 101.Furthermore, at the base of the wind turbine tower 1, the wind turbine100 comprises a transformer 106 for connection to the electrical grid.The generator 104 and the transformer 106 are connected via powerconduction means 33 for transmitting the power generated by thegenerator 104 to the grid.

Furthermore, a climbing device 36, which includes illuminating means 35,for operating personnel is fastened in the interior of the wind turbinetower 1 to the tower inner wall, wherein the illuminating means compriselamps arranged discretely or continuously. In order to activate theoperation controller 105, signal conduction means 34 are provided in thetower interior. The power conduction means 33, signal conduction means34, illuminating means 35 and the climbing device 36 for operatingpersonnel are referred to in summary as system components 33, 34, 35,36.

The system components 33, 34, 35, 36 are divided in each case intoindividual segments. The segments of at least two different systemcomponents 33, 34, 35, 36 are structurally combined to form a separatesupply module 3, 4. The structural combining simplifies the fitting ofthe supply modules 3, 4 after the wind turbine tower 1 has been erected.The supply modules 3, 4 each have an upper edge 37, 47 and a lower edge38, 48. The upper segment end 30, 40 of the system components 33, 34,35, 36 is arranged on the upper edge 37, 47. Accordingly, the lowersegment end 31, 41 of the system components 33, 34, 35, 36 is arrangedon the lower edge 38, 48 of the separate supply module 3, 4.

In a first preferred embodiment, the separate supply modules 3, 4 can bepreassembled at the works. Alternatively, in a second preferredembodiment, the separate supply modules 3, 4 can be assembled at theconstruction site. The preassembly of the supply modules can take placein the horizontal position.

The wind turbine tower 1 is erected from the tower segments 10 to 16. Aworking platform 6 is installed at the upper end 17 of the wind turbinetower 1 after erection. The working platform 6 is used for theinstallation personnel to be on during the erection and installationwork on the wind turbine tower 1. Furthermore, the working platform canbe used for subsequent maintenance work, in particular at the transitionpiece to the hybrid tower. The working platform 6 can have rails andeyes for safety ropes.

The working platform 6 can extend over the entire tower inside diameterand can have a suitable cutout for the system components. The separatesupply modules are then guided downward through the cutout in theworking platform 6. Individual supply modules can be provided withadditional components (for example feed boxes), as a result of which thecross section of the supply modules is increased. In order also topermit the fitting of said separate supply modules, the working platform6 can be equipped with a floor flap, as a result of which the cutout inthe working platform can be temporarily enlarged for the passage of saidadditional components.

Furthermore, for the preparation of the fitting of the separate supplymodules 3, 4, a holding device 5 is fastened to the upper end 17 of thewind turbine tower 1. In a first embodiment, the holding device 5comprises two connecting devices 51, 52 for the connection to a separatesupply module 3, 4. A connecting device 51, 52 is formed from twoshackles, which are coupled to each other and are fastened to a loadring 53, which is fastened to the tower wall. A supply module 3, 4 canbe suspended on the shackles by means of a support plate 54 which haseyes 39 for this purpose. The holding device 5 is designed here in sucha manner that it can be loaded with the entire weight of all of theseparate supply modules 3, 4 to be fitted.

However, in a second alternative embodiment, the support plate 54 canalso be designed as an elbow and, for the temporary suspension of aseparate supply module 3, 4, can be hung directly over the tower upperedge. The support plate 54 is then fastened to the tower upper edge, forexample by means of bolts. In addition, precision bolts may be providedas security against slipping off.

Furthermore, in a third embodiment, a support element 55, on which asupport module 8 can be mounted, is provided on the holding apparatus 5.For this purpose, the support module 8 has a resting portion 82 which isformed in a complementary manner with respect to the support element 55and is bordered by a flange 83. The resting portion 82 is arranged onthe support element 55. The support module 8 is secured againstdisplacement from the support element 55 by means of the flange 83. Thesupport module 8 furthermore has a mounting portion 81. A mountingelement 49 fastened to the separate supply module 3, 4 can be arrangedin the mounting portion 81. It is thus possible to suspend the separatesupply modules 3, 4 on the support module 8 in an uncomplicated mannerafter introduction into the wind turbine tower 1. Given a suitabledesign of the tower upper edge, the support module 8 can be fastened tothe tower upper edge even without the use of a support element 55.

By means of the use of lifting slings, the suspension of the supplymodules 3, 4 on the support module 8 can be further simplified. For thefastening to the holding apparatus 5 after removal of the support module8, the final separate supply module 4 introduced into the wind turbinetower 1 can be fastened to the shackles or to the tower upper edgedirectly via an angled support plate 54. A fastening apparatus 9 isprovided for the final fastening of the separate supply modules 3, 4 tothe tower inner wall 7. The fastening apparatus 9 comprises a clampingelement 92 which is fastened to the support module 3, 4 by means offastening elements 93. The fastening elements 93 are reachable from thefront side of the separate supply modules 3, 4 and can be actuated fromthere. A guide element 94 is provided between the clamping element 92and the supply module 3, 4. The guide element 94 furthermore has spacers95, 96 and a fastening piece 91. The fastening piece 91 projectslaterally from the supply module. It can easily be reached by theinstallation personnel for connection to the tower wall. The spacer 96spaces the separate supply module 3, 4 and the wall. The spacer 95furthermore acts as a resting element and guide element for the clampingelement 92.

By actuation of the fastening elements 93, the clamping element 92 ispressed against the separate supply module 3, 4. The clamping element 92presses here onto the guide element 94 via the spacer 95. As a result,the guide element 94 is clamped between the clamping element 92 and theseparate supply module 3, 4.

FIG. 2a illustrates a wind turbine tower 1 with a working platform 6 atthe upper end 17 thereof, said wind turbine tower having been erectedfrom the tower segments 10 to 16. The tower segments 10 to 16 form aconcrete tower 19 which, in this preferred embodiment, acts as a lowerpart of a hybrid tower.

In order to introduce the supply modules into the wind turbine tower 1,the holding device 5 is installed at the upper end of the wind turbinetower 1. A support module 8 is placed onto the holding device 5.

For the fitting of the system components, a first separate supply module3, which in the completely constructed state of the wind turbine 100 isarranged at the base of the wind turbine tower 1, is disposed onto theupper end 17 of the wind turbine tower 1 with a crane (not illustrated).The guide elements 94 of the fastening apparatuses 9 fastened to theseparate supply module 3 are still free here and can be moved along thesupply module 3 in the vertical direction.

The installation personnel on the working platform 6 guide the firstseparate supply module 3 during the subsequent lowering thereof into theinterior of the wind turbine tower 1.

For better clarity, the wall portions concealing the tower interior havebeen omitted in FIGS. 2b, 2c, 2d, 3a, 3d and 8 such that the tower innerwall 7 is visible.

The first separate supply module 3 is lowered into the tower interioruntil the upper edge 37 of the supply module 3 is arranged at the upperend 17 of the wind turbine tower 1. At the same time, the upper edge isarranged on the working platform 6 in such a manner that theinstallation personnel can carry out work on the upper edge 37 from theworking platform. The first separate supply module 3 is hung onto theholding device 5 at the mounting portion 81 of the support module 8 bymeans of the mounting element 49. The first separate supply module 3 isthen released by the crane and hangs with its full weight on the holdingdevice 5. Furthermore, the upper segment ends 30 of the systemcomponents 33, 34, 35, 36 are likewise arranged at the upper end 17 ofthe wind turbine tower 1. The first separate supply module 3 spans aplurality of the tower segments 10 to 16. That is to say the upper edge37 of the first separate supply module 3 is arranged on a differenttower segment 10 to 16 than the lower edge 38 of the first separatesupply module 3.

In a further step, the second separate supply module 4 is raised withthe crane and arranged with its lower edge 48 on the upper edge 37 ofthe first separate supply module 3. The lower segment ends 41 of thesystem components 33, 34, 35, 36 of the second separate supply module 4are aligned with the upper segment ends 30 of the system components 33,34, 35, 36 of the first separate supply module 3. After the alignment,the upper segment ends 30 are connected to the lower segment ends 41 bythe installation personnel. The installation personnel can carry thisout from the working platform 6. After the connection of the uppersegment ends 30 and the lower segment ends 41, the first separate supplymodule 3 and the second separate supply module 4 are connected to eachother.

After the connection of the first and second separate supply module 3,4, the holding device 5 is released from the first separate supplymodule 3. The supply module 3 is unhooked from the support module 8. Theseparate supply modules 3, 4 which are connected to each other arelowered further into the tower interior by the crane until the upperedge 47 of the second separate supply module 4 is arranged at the upperend of the wind turbine tower 1. The second separate supply module 4 isthen hung on the holding device 5 by means of the mounting element 49,which is fastened to the separate supply module 4, and the supportmodule 8, and released from the crane. In an alternative embodiment, thesupply module is hung by means of lifting slings of the holding device5. The above-mentioned steps are repeated for all of the separate supplymodules to be fitted, except for the final one. In a first embodiment,the final separate supply module is fastened to the holding device 5 viathe connecting devices 52. For this purpose, the connecting devices 52are guided through the holding eyes 39 of the support plate 54 of thefinal separate supply module and locked.

In an alternative embodiment, the support plate of the final separatesupply module is of angled design. The final separate supply module canbe hung over the tower upper edge with the aid of the angled supportplate 54 and fastened there with bolts. Furthermore, the angled supportplate 54 can be fastened to a tubular steel tower 18 to be placed ontothe concrete tower 19.

After the introduction of all of the further separate supply modules 4into the tower interior, the first separate supply module 3 is arrangedat the tower base and forms the lowermost separate supply module. Afterthe connection and lowering of the seperate supply modules 3, 4, thecomplete supply module hangs on the holding device 5. In a further step,the separate supply modules 3, 4 are connected to the tower inner wall 7by the fastening pieces 91 being fastened to the tower inner wall 7.Furthermore, the fastening elements 93 are actuated such that the supplymodules 3, 4 can be pulled onto the tower inner wall 7 via the clampingelements 92 and the guide elements 94. By means of the connection to thetower inner wall via the fastening device 9, in particular adisplacement of the supply module in a horizontal plane is prevented.The main load of the supply module hangs on the holding device 5.

After the fitting of the supply modules into the concrete tower 19, atubular steel tower 18 is placed onto the concrete tower 19. The systemcomponents 33, 34, 35, 36 installed in the tubular steel tower 18 areconnected to the upper segment ends 40. The lower segment ends 31 of thefirst separate supply module 3 are optionally likewise connected to thesystem components 33, 34, 35, 36 installed in the tower base.

1. A method for installing tower fittings into a wind turbine towercomprising: arranging an upper edge of a first separate supply module ofat least two separate supply modules at an upper end of the wind turbinetower, wherein each separate supply module of the at least two separatesupply modules comprises one segment each of at least two systemcomponents of the wind turbine tower; connecting an upper segment endarranged on the upper edge of the first separate supply module to alower segment end arranged on a lower edge of a corresponding systemcomponent of a second separate supply module; and arranging an upperedge of the second separate supply module at the upper end of the windturbine tower.
 2. The method of claim 1, comprising providing a workingplatform at the upper end of the wind turbine tower prior to arrangingthe upper edge of the first separate supply module at the upper end ofthe wind turbine tower.
 3. The method of claim 1, wherein, prior toarranging the upper edge of the first separate supply module at theupper end of the wind turbine tower, providing a holding apparatus atthe upper end of the wind turbine tower for the at least temporarysuspension of a separate supply module.
 4. The method of claim 3,wherein the holding apparatus comprises at least one connecting devicefor connecting to the separate supply module.
 5. The method of claim 3,wherein the holding apparatus has at least one load ring which isfastened to a tower wall or a tower upper edge and to which, afterintroduction of a final separate supply module, the final separatesupply module is fastened.
 6. The method of claim 3, wherein, after theintroduction of a final separate supply module, the final separatesupply module is hung over a tower upper edge with the aid of at leastone angled support plate and is fastened to a tower wall or tower upperedge.
 7. The method of claim 3, wherein the connecting device comprisesat least one shackle or at least one lifting sling.
 8. The method ofclaim 3, wherein the holding apparatus comprises at least one supportelement which is fastened to a tower wall and to which a support modulecomprising a mounting portion is releasably fastened, wherein the firstseparate supply module has a mounting element with which the firstseparate supply module, after the arrangement of the upper edge at anupper end of the wind turbine tower, is mounted on the mounting portionof the support module.
 9. The method of claim 3, comprising suspendingthe first separate supply module at the upper end of the wind turbinetower prior to connection of the segments of the system components ofthe first and second separate supply modules.
 10. The method of claim 1,comprising forming the wind turbine tower from at least two towersegments.
 11. The method of claim 10, wherein a separate supply moduleof the at least two separate supply modules spans a plurality of towersegments.
 12. The method of claim 1, wherein the system componentscomprise a power conductor, a signal conductor, an illuminator or aclimbing device for operating personnel.
 13. The method of claim 1,comprising installing a tubular steel tower as an upper part of the windturbine tower, wherein the lower part is a concrete tower ; andintroducing the at least two separate supply modules into the concretetower prior to installing the tubular steel tower.
 14. The method ofclaim 1, wherein, prior to arranging the upper edge of the firstseparate supply module at the upper end of the wind turbine tower,fastening at least one fastening apparatus to at least one of theseparate supply modules, wherein the at least one fastening apparatuscomprises a clamping element which is connected to the supply module anda guide element comprising a fastening piece projecting laterally on thesupply module, which is arranged between the clamping element and thesupply module.
 15. The method of claim 14, wherein, after introductionof a final separate supply module, the fastening apparatus is fastenedto the tower wall of the wind turbine tower using the fastening piece;and the guide element is clamped to the final supply module using theclamping element.
 16. A wind turbine tower, comprising a holdingapparatus for the suspension of a separate supply module at the upperend of the wind turbine tower for carrying out the method of claim 1.17. The wind turbine tower of claim 16, wherein the holding apparatuscomprises at least one connecting device for connecting to the separatesupply module.